Revert "add STK errors" as it fails some tests

This reverts commit 27750d5.

error_sd.go

@@ -4,7 +4,6 @@ package bluetooth
 
 // #include "nrf_error.h"
 // #include "nrf_error_sdm.h"
-// #include "ble_err.h"
 import "C"
 
 // Error is an error from within the SoftDevice.
@@ -75,22 +74,7 @@ func (e Error) Error() string {
 		return "other SoC error"
 	case e >= C.NRF_ERROR_STK_BASE_NUM && e < 0x4000:
 		// STK errors.
-		switch e {
-		case C.BLE_ERROR_NOT_ENABLED:
-			return "sd_ble_enable has not been called"
-		case C.BLE_ERROR_INVALID_CONN_HANDLE:
-			return "invalid connection handle"
-		case C.BLE_ERROR_INVALID_ATTR_HANDLE:
-			return "invalid attribute handle"
-		case C.BLE_ERROR_INVALID_ADV_HANDLE:
-			return "invalid advertising handle"
-		case C.BLE_ERROR_INVALID_ROLE:
-			return "invalid role"
-		case C.BLE_ERROR_BLOCKED_BY_OTHER_LINKS:
-			return "the attempt to change link settings failed due to the scheduling of other links"
-		default:
-			return "other STK error"
-		}
+		return "other STK error"
 	default:
 		// Other errors.
 		return "other error"